/Engine/Source/Runtime/Engine/Public/CanvasTypes.h
Generates a newFCanvasTriangleRendererItemfor the current sortkey and adds it to the sortelement list of items to render
void AddTriangleRenderItem ( const [FCanvasUVTri](API\Runtime\Engine\Engine\FCanvasUVTri) & Tri, const [FMaterialRenderProxy](API\Runtime\Engine\Materials\FMaterialRenderProxy) * MaterialRenderProxy, [FHitProxyId](API\Runtime\Engine\FHitProxyId) HitProxyId, bool bFreezeTime )